I used to wick my soy with a cd10...with my latest lot of soy I use a cd12 mainly. Wicks also differ from supplier to supplier....so your cd10, may burn like another suppliers cd12. It is important to stick with one supplier on your wicks. Soy changes batch to batch....which is why it is a good idea to purchase as many cases pf the same batch as possible. That way you don't have to keep retesting your wicks. Back when I started, I used 51z and lx 16 in a 8oz jelly jar. But I like cd's the best. I don't like how fragile the lx wicks are, it is too easy for people to break them off when they are trying to trim them, in my opinion. From my past experience, these are similar....51z, cd10, lx16.